3Com 3C10111C - NBX 100 - Modular Exp Base, Руководство по установке, Страница: 38 / 210

38 C
HAPTER
1: I
NTRODUCTION
10BASE-T Uplink Card The 10BASE-T Uplink Card provides eight 10BASE-T Ethernet ports to
connect 3Com Telephones (or other 10BASE-T devices) to the LAN. The
Uplink Card (
3C10370)
replaces the 10BASE-T Hub Card (3C10115).
Figure 13 NBX Uplink Card (3C10370)
The NBX 10BASE-T Uplink Card contains the following status lights and
connectors:
■
Status Lights (PWR and 1 through 8) — These lights indicate the
status of power to the hub and the status of the 10BASE-T ports.
■
Ethernet Hub Ports (8) — These RJ-45 MDI-X ports connect devices
to the LAN.
Analog Terminal Card Each Analog Terminal Card allows up to four analog (2500-series
compliant) telephones, cordless telephones, and Group-3 fax machines to
operate with NBX systems. The SuperStack 3 NBX system supports up to
375 Analog Terminal Cards, for a total of 1500 devices. The NBX 100
system supports up to 50 Analog Terminal Cards, for a total of 200
devices.
However, see “System Configuration Guidelines” on page 47 .
CAUTION: If you are using the 3Com SuperStack II ARPS (Advanced
Redundant Power Source) as a backup power supply for the NBX
Gateway Chassis, you can have no more than 2 Analog Terminal Cards of
Models 3C10117, 3C10117A, or 3C10117B-INT per Gateway Chassis.
This restriction does not apply to the 3C10117C Analog Terminal Card.
When an Analog Terminal Card senses that a port is being used for fax
transmission, it switches that port to
reliable mode. Unlike normal voice
transfers, which drop packets when they encounter congestion, reliable
mode transmissions take as much time as needed to ensure that there are
no lost packets. However, reliable mode also uses twice the bandwidth.
PWR
1
1 2 3 4 5 6 7
8
8
3C10370 3Com NBX Uplink Card